TY  - BOOK
AU  - Asthana, D. K.
AU  - Asthana, M.
TI  - A textbook of environmental studies for undergraduate students: as per UGC syllabus
SN  - 9788121927642
AV  - DUCE RA427.3.A57 
PY  - 2006///
CY  - New Delhi
PB  - S. Chand
KW  - Science
N1  - Includes glossary and index
ER  -